Glass filter



FIG. 1 is a rear, top, right perspective view of the design;

FIG. 2 is a rear elevation thereof;

FIG. 3 is a front elevation thereof;

FIG. 4 is a right side elevation thereof;

FIG. 5 is a top plan view thereof;

FIG. 6 is a bottom plan view thereof;

FIG. 7 is a left side elevation thereof; and,

FIG. 8 is a cross section along line 8-8 of FIG. 1 . 

CLAIM The ornamental design for a glass filter, as shown and described. 